tarsnap-keygen
Generate a key file for use with Tarsnap, an online backup service.
TLDR
Register a machine with the Tarsnap server
$ sudo tarsnap-keygen --keyfile [path/to/file.key] --user [user_email] --machine [machine_name]
Encrypt the key file (a passphrase will be requested twice)
$ sudo tarsnap-keygen --keyfile [path/to/file.key] --user [user_email] --machine [machine_name] --passphrased
